CVE-2022-33749Network attack vector

Unauthenticated toolstack denial via file-descriptor exhaustion

Published Oct 11, 2022 · Updated Aug 3, 2024

Resource exhaustion in all versions of Xen Project XAPI allows remote attackers to interrupt the toolstack via network requests. Unauthenticated network traffic to the XAPI HTTP interface consumes file descriptors without an effective bound until the process reaches its limit. Exposure requires the XAPI listening interface to be reachable by untrusted clients; exhaustion blocks trusted connections and tasks that need file descriptors, including guest toolstack actions.

CVSS severity5.3
Medium
EPSS probability0.95%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in all versions of Xen Project XAPI allows remote attackers to interrupt the toolstack via network requests. Unauthenticated network traffic to the XAPI HTTP interface consumes file descriptors without an effective bound until the process reaches its limit. Exposure requires the XAPI listening interface to be reachable by untrusted clients; exhaustion blocks trusted connections and tasks that need file descriptors, including guest toolstack actions.

The record

CVE
CVE-2022-33749
Published
Oct 11, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 11, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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